Search results for "Instrument"
showing 10 items of 5652 documents
Frequency Based Detection and Monitoring of Small Scale Explosive Activity by Comparing Satellite and Ground Based Infrared Observations at Stromboli…
2014
Abstract Thermal activity is a common precursor to explosive volcanic activity. The ability to use these thermal precursors to monitor the volcano and obtain early warning about upcoming activity is beneficial for both human safety and infrastructure security. By using a very reliably active volcano, Stromboli Volcano in Italy, a method has been developed and tested to look at changes in the frequency of small scale explosive activity and how this activity changes prior to larger, ash producing explosive events. Thermal camera footage was used to designate parameters for typical explosions at Stromboli (size of spatter field, cooling rate, frequency of explosions) and this information was a…
Intercomparison of SO2 camera systems for imaging volcanic gas plumes
2015
Abstract SO 2 camera systems are increasingly being used to image volcanic gas plumes. The ability to derive SO 2 emission rates directly from the acquired imagery at high time resolution allows volcanic process studies that incorporate other high time-resolution datasets. Though the general principles behind the SO 2 camera have remained the same for a number of years, recent advances in CCD technology and an improved understanding of the physics behind the measurements have driven a continuous evolution of the camera systems. Here we present an intercomparison of seven different SO 2 cameras. In the first part of the experiment, the various technical designs are compared and the advantage…
Dificultades de interpretación y de uso de los arrastres en Cabri 3d por estudiantes de E.S.O.
2012
La presente memoria corresponde al Trabajo Fin de Máster demandado dentro del programa del Máster de Investigación de Didácticas Específicas de la Universidad de Valencia. En este proyecto pretendemos contribuir a la mejora de la calidad docente a través de una mejor comprensión del aprendizaje en entornos colaborativos con programas de geometría dinámica. La aparición de programas de geometría dinámica en 3D (PGD 3D) ofrece la oportunidad de utilizarlos en el ámbito escolar. En este sentido, resulta pertinente hacerse las siguientes preguntas genéricas a partir de las cuales surgirán nuestras preguntas de investigación: § ¿Cuáles son la naturaleza y el alcance de la integración de PGD 3D e…
Glyphosate Sensor Based on Nanostructured Water-Gated CuO Field-Effect Transistor
2022
This research presents a comparative analysis of water-gated thin film transistors based on a copper oxide (CuO) semiconductor in the form of a smooth film and a nanostructured surface. A smooth CuO film was deposited through reactive magnetron sputtering followed by annealing in atmosphere at a temperature of 280 (Formula presented.) C. Copper oxide nanostructures were obtained by hydrothermal synthesis on a preliminary magnetron sputtered 2 nm thick CuO precursor followed by annealing at 280 (Formula presented.) C. An X-ray diffraction (XRD) analysis of the samples revealed the presence of a tenorite (CuO) phase with a predominant orientation of (002). Scanning electron microscopy (SEM) a…
Epistemic network analyses of economics students' graph understanding. An eye-tracking study
2020
Learning to solve graph tasks is one of the key prerequisites of acquiring domain-specific knowledge in most study domains. Analyses of graph understanding often use eye-tracking and focus on analyzing how much time students spend gazing at particular areas of a graph&mdash
Arduino kā instruments dizaina un tehnoloģiju apguvei 8. klasē
2022
Diplomdarba autors: Stehans Altuhovs. Diplomdarba nosaukums: Arduino kā instruments priekšmeta “Dizains un tehnoloģijas” apguvei 8. klasē Diplomdarba mērķis ir izpētīt mikrokontroliera Arduino apguves un izmantošanas iespējas mācību priekšmetā “Dizains un tehnoloģijas” 8. klases skolēniem. Darba teorētiskajā daļā tika atspoguļota esošā situācija ar mācību priekšmetam “Dizains un tehnoloģijas” pieejamo instrumentu klāstu, detalizēta šo instrumentu klasifikācija un dots instrumentu raksturojums. Darba teorētiskajā daļā tika pētīta Arduino pielietošanas prakse vispārizglītojošo mērķu sasniegšanai dažādās valstīs, piemēram, ASV, Lielbritānija, Vācija, u.c., kā tas minēts dažādos pētījumos. Darb…
Naruszenie bezpieczeństwa stosowania elektronicznych instrumentów płatniczych w świetle prawa karnego - zagadnienia wybrane
2018
Elektroniczne instrumenty płatnicze znajdują swój początek w powstaniu handlu elektronicznego. Jednak nieustanne poszerzanie sposobów dostępu do środków zgromadzonych na rachunku powoduje, iż zakres elektronicznych instrumentów płatniczych nieustannie się zmienia. Uniwersalność elektronicznych instrumentów płatniczych oraz szeroki zakres sposobów dostępu do środków pieniężnych wpływają na niespotykaną rozpiętość przestępstw – od blokowania kasetki do wydawania pieniędzy w bankomacie, a kończąc na zaawansowanych technologicznie przestępstwach internetowych. Zagrożenie stanowi także szybkość wymiany oraz dostępność informacji dotyczących sposobów popełniania przestępstw, wykorzystywanie luk t…
A PTFE membrane for the in situ extraction of dissolved gases in natural waters: Theory and applications
2005
A new method for extracting dissolved gases in natural waters has been developed and tested, both in the laboratory and in the field. The sampling device consists of a polytetrafluroethylene (PTFE) tube (waterproof and gas permeable) sealed at one end and connected to a glass sample holder at the other end. The device is pre-evacuated and subsequently dipped in water, where the dissolved gases permeate through the PTFE tube until the pressure inside the system reaches equilibrium. A theoretical model describing the time variation in partial gas pressure inside a sampling device has been elaborated, combining the mass balance and "Solution-Diffusion Model" (which describes the gas permeation…
Minimum detection limits and applications of proton and helium induced X-ray emission using transition-edge sensor array
2017
Abstract We have determined minimum detection limits, MDLs, for elements 14 ⩽ Z ⩽ 86 using a transition-edge sensor array, TES array, and as a comparison using an Amptek X-123SDD silicon drift detector, SDD. This was done using a 3 MeV proton beam and a 5.1 MeV helium beam. MDLs were determined for a thin film sample on top of C substrate, and for a bulk sample containing mostly Al. Due to the higher peak-to-background ratio, lower detection limits were obtainable using the TES array for most of the elements. However, for elements 30 ⩽ Z ⩽ 45 the performance of the TES array was not as good as the SDD performance. This is due to the limitations of the TES used at energies >10 keV. The great…
Review of Particle Physics
2020
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,143 new measurements from 709 papers, we list, evaluate, and average measured properties of gauge bosons and the recently discovered Higgs boson, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle properties and search limits are listed in Summary Tables. We give numerous tables, figures, formulae, and reviews of topics such as Higgs Boson Physics, Supersymmetry, Grand Unified Theories, Neutrino Mixing, Dark Energy, Dark Matter, Cosmology, Particle Detectors, Colliders, …